Instrotech’s precision Series 33X and 35X pressure transmitters from Keller AG features a floating measurement cell, digital signal processing and compensation that produces reference accuracies of up to 0,05% FS error bandwidth.
The floating piezoresistive sensor element is free of outside influence from mechanical and thermal forces at the pressure connection. The A/D converter in the signal processor operates with a resolution of 16 bits (0,0002%FS), using the signals from the pressure sensor and the integrated temperature sensor to calculate accurate compensated measurement values in just a few milliseconds.
The transmitter’s analogue output is updated at least 400 times per second with overall accuracy of 0,05%FS (including temperature influence in the 10-40°C range). As an option, precision of 0,01%FS in the same temperature range is available, in relation to the reference values of primary standards (accuracy: 0,025%).
The digital output permits functions such as direct display of measured pressure values on a laptop or PC and serial networking for up to 128 transmitters. Depending on the plug type and the number of contacts available, the transmitters provide a digital output (RS485) as well as an analogue current and voltage output, eg, 0-10 V (3-wire); 4-20 mA (2-wire).
Measurement ranges from 0,8 bar and 1000 bar can be supplied for absolute, gauge, and differential pressures. High overpressure measurements are possible, depending on the structural design. The pressure port can be a threaded connection 33X, or a front-flush diaphragm 35X. Due to the digital interface (RS485), the analogue signal span and zero can be adjusted across the whole measurement range, to suit specific applications.
Users have a choice of three electrical plug connectors. These are easily changed when the instruments are used in different environments. If protection class IP68 is required (standard for the 36X W depth sensor), a version with a cable is also available.
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